Polyurethane solvent based

Sultan Nasar A, Srinivasan G, Mohan R, Radhakrishnan G (1998) Polyurethane solvent-based adhesives for footwear applications. J Adhes 68 21... 

Uses Industrial coating foam control agent for epoxy, polyurethane, solvent base systems... 

Waterborne polyurethanes that have the performance of solvent-based systems can be made via tailored emulsion polymerization (Hagernrother and Ruttmann, 1990). 

As with water-based latex paints, the substrate on which the solvent-based paint is applied will influence the emission rates of VOCs. Kwok et al. (2003) showed that emission rates of aromatic VOCs from a polyurethane lacquer in the first 10 hours were 65% greater when the substrate was aluminum rather than plywood. VOCs from the former were emitted in an evaporation process, while from the latter they emitted largely in a diffusion-controlled process. 

LAWSON, G. et al. (1996) Chemical composition and migration level of packaging adhesives. Summary report Polyurethane adhesives (solvent based). MAFF Project No. IC074. 

Laminating adhesive (solvent-based MDl-based polyether polyurethane 2.5 g/m containing 1-5% 4,4 MDI)... 

Polysulfone A number of adhesives have been found useful for joining polysufone to itself or to other materials. These include 3M Company s EC 880 solvent-base adhesive, EC 2216 room-temperaturecuring epoxy two-part paste, Bloomingdale Division, American Cyana-mid Company BR-92 modified epoxy with DICY curing agent, or curing agent "Z" (both spreadable pastes), vinyl-phenolics, epoxy-nylons, epoxies, polyimide, rubber-based adhesives, styrene polyesters, resorcinol-formaldehyde, polyurethanes, and cyanoacrylates. The EC 880, EC 2216, and the two BR-92 adhesives are recommended by the polysulfone manufacturer. Union Carbide (16) (17). 

Water-Base Mold Releases. Water-base release agents are being used more widely. Solvent-base agents evaporate too quickly in warm areas. One example is a hydro-alcoholic solution of saponified fatty acids claimed to produce a dry-fihn coating. Axel Plastics Research Laboratories in Woodside, NY has a new product. Mold Wiz H40-3U, for flexible polyurethane foam. This material is heated to evaporate the water and is then applied with high-pressure spray equipment (44). 

Mortrim [Morton], TM for a series of one and two-component solvent-based and water-based polyurethane adhesives. 

In contrast to solvent-based systems, the PUR dispersions (Section 5.4) are characterized by their incombustibility and thus by considerably smoother processing. They are high molecular weight hydroxyl polyurethanes disperged in water. Apart from the physically setting one-component systems, two-component systems are also applied, with component B containing special polyisocyanates that react with the -O-H-groups of the hydroxyl polyurethane in aqueous solution. 

The superior characteristics of polyester polyol based polyurethanes are explained by a better crystalline structure [1, 7] in the urethane segment, compared to the majority of poly ether polyols which are amorphous [except polytetrahydrofuran (PTHF)], due to the superior secondary forces between the polyester chains [8] and also due to a superior thermal and fire resistance, compared to polyether polyol based polyurethanes. Polyester-based polyurethanes (flexible foams, coatings), have a superior solvent resistance compared to the polyether-based polyurethanes [8]. 

Aettron NX. [Protex] 2,4,6-Tti-dimeth-ylaminmnethylphenol accelerattH for solvent based and powder coating (epoxy, polyurethane). 

Milloxane. [Polyurethane Spec.] Water-based, solvent-based and 100% solid polyurethanes. 

Reodorants. [Givaudan-Roure] Mixture of essmidal oils and aromadc chemicals masking agoits for formaldehyde, latex coadngs, finishes, polyurethane latex foam baclung, solvent-based print pastes. 

Since the 1970s a trend to use water-based coating systems and glues instead of solvent-based products has been apparent. Most water-based paints and lacquers use polyurethane or acrylate as binders. For technical reasons the systems still contain organic cosolvents as well as pigments, biocides and surfactants (Hansen et al., 1987). 

Combinations of bitumen with reaction-curing paint binders (e.g., epoxy resins and polyurethanes) are not usually employed in solvent-based paints due to their unsatisfactory compatibility. Only with high epoxy resin contents can a certain compatibility be achieved by addition of solubilizing phenols and aromatic oils. 

As previously noted, the primary use for this elastomer has been as solvent-based adhesives and sealants. Solvent-based products are losing market share to water-based poly-chloroprenes, to other polymer types such as acrylics and polyurethanes, and to hot melt adhesives. However, where the processing facility is able to contain the vapor emissions, a solvent-based adhesive or sealant is preferred because of better wetting of surfaces, faster drying, and higher performance of the cured or dried product. Many rubber bonding... 

Solvent-borne adhesives represent the majority of the volume in the packaging market, with both one- and two-component systems being used. Waterborne polyurethane adhesives are a much smaller segment that has been driven by environmental considerations. Growth has slowed in recent years because of generally inferior performance compared to solvent-based adhesives and because most of the major converters have already made capital investments in solvent recovery systems. 

The furniture industry uses polyurethane adhesives to bond veneers of various composition to boardstock and metal substrates. Both waterborne and solvent-based adhesives are used. 

---